6BJC

TPX2_mini decorated GMPCPP-microtubule


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.3 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insight into TPX2-stimulated microtubule assembly.

Zhang, R.Roostalu, J.Surrey, T.Nogales, E.

(2017) Elife 6: --

  • DOI: 10.7554/eLife.30959

  • PubMed Abstract: 
  • During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The molecular mechanism of how TPX2 stimulates MT assem ...

    During mitosis and meiosis, microtubule (MT) assembly is locally upregulated by the chromatin-dependent Ran-GTP pathway. One of its key targets is the MT-associated spindle assembly factor TPX2. The molecular mechanism of how TPX2 stimulates MT assembly remains unknown because structural information about the interaction of TPX2 with MTs is lacking. Here, we determine the cryo-electron microscopy structure of a central region of TPX2 bound to the MT surface. TPX2 uses two flexibly linked elements ('ridge' and 'wedge') in a novel interaction mode to simultaneously bind across longitudinal and lateral tubulin interfaces. These MT-interacting elements overlap with the binding site of importins on TPX2. Fluorescence microscopy-based in vitro reconstitution assays reveal that this interaction mode is critical for MT binding and facilitates MT nucleation. Together, our results suggest a molecular mechanism of how the Ran-GTP gradient can regulate TPX2-dependent MT formation.


    Organizational Affiliation

    Molecular Biophysics and Integrative Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tubulin alpha-1B chain
A, C, E, J, L, K
451Sus scrofaGene Names: TUBA1B
Find proteins for Q2XVP4 (Sus scrofa)
Go to Gene View: TUBA1B 
Go to UniProtKB:  Q2XVP4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tubulin beta chain
B, D, F, H, G, I
445Sus scrofaN/A
Find proteins for P02554 (Sus scrofa)
Go to UniProtKB:  P02554
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Targeting protein for Xklp2
T, P
747Homo sapiensGene Names: TPX2 (C20orf1,C20orf2,DIL2,HCA519) 
Find proteins for Q9ULW0 (Homo sapiens)
Go to Gene View: TPX2 
Go to UniProtKB:  Q9ULW0
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download SDF File 
Download CCD File 
A, C, E, J, K, L
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
G2P
Query on G2P

Download SDF File 
Download CCD File 
B, D, F, G, H, I
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
GXTIEXDFEKYVGY-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.3 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-11-05 
  • Released Date: 2017-11-22 
  • Deposition Author(s): Zhang, R., Nogales, E.

Funding OrganizationCountryGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM051487
Howard Hughes Medical InstituteUnited States--
Cancer Research UKUnited KingdomFC001163
Medical Research Council (United Kingdom)United KingdomFC001163
Wellcome TrustUnited KingdomFC001163

Revision History 

  • Version 1.0: 2017-11-22
    Type: Initial release